Method of manufacturing sliding clasp fasteners



Jan. 5, 1943. J. K.UNA 2,307,410

METHOD OF MANUFACTURING SLIDING CLASP FASTENERS Filed June 29, 1940 4'Sheets-Sheet l hwentor Atty/leg J 5, 19 3- J. KUNA 2,307,410

METHOD OF MANUFACTURING SLIDING CLASP FASTENERS Filed June 29, 1940 4 Sheets-Sheet 2 Jan. 5, 1943. J, KuN 2,307,410 METHOD OF MANUFACTURING SLIDING CLASP FASTENERS Filed June29, 1940 4 Sheets-Sheet 3 f I V i Jan. 5, 1943.

J. KUNA METHOD OF MANUFACTURING SLIDING CLASP FASTENERS 4 Sheets-Sheet 4 Filed June 29, 1940 I I a Patented Jan. 5, 1943 r 2,307,410 METHOD OF MANUFACTURING SLIDING CLASP FASTENERS I Iosef Kuna, London, half to Brevetia British company Application June 29, In Great Britai 10 Claims.

The present invention relates to sliding clasp fasteners, the fastening members and preferably also stop members of which are made of nonmetallic material such as Celluloid or other cellulosic material, Bakelite and analogous materials, now commonly embraced in the term plastics.

' An object of this invention is to provide animproved sliding clasp fastener of this kind.

An object of this invention is to provide an improved method of makingsuch fasteners, and particularly of assembling the non-metallic members on their flexible supports.

Still another object is to non-metallic stop members for teners.

A further object of the invention is to prevent any damage to the flexible supports during the manufacture of the sliding clasp fasteners.

Other objects and advantages of the invention will become apparent from'the sub-joined detailed description taken in conjunction with the accompanying drawings in which Fig. 1 is a view of one form of a complete sliding clasp fastener embodying the'invention, Figs. 2, 3 and 4 are perspective views illustrating steps in the manufacture of the fastener of Fig, 1,

Fig. 5 is a view in greater'detail of one of the fastening members of the fastener of'Fig. 1,

Fig. 6 is a perspective view of part of a stop member at the open, upper, end of the sliding clasp fastener of Fig. 1, Y

Figs. 7 and 8 are perspective views showing both sides of partof the stop member at the closed, lower, end of the fastener of Fig. 1,

Figs. 9 and 10 are more detailed views respectively of the upper and lower end of the fastener of Fig. 1 in closed position,

Figs. 11 to 20 are views corresponding respectively to those of Figs. 1 to 10, of another embodiment.

Referring first to Figs. 1 to 10, the sliding clasp fastener illustrated comprises a pair of similar tapes I or other flexible supports each having attached to it a series of fastening members denoted generally by I3 spaced longitudinally along the edge I4 of the tape, which edge is shown as being beaded or thickened. A pair of stop members denoted generally by I6 are provided at the open, upper, end of the fastener, one attached to each tape I0, and a single stop member I! is attached to both tapes at the closed, lower, end of the fastener. The member I3 are provided with coupling projections I-8 and corresponding provide improved sliding clasp fasrecesses I9 (shown more clearly in Fig. the

England, assignor of one- Limited, London, England, a

1940, Serial No; 343,060

11 January 22, 1940' members made of and enabling all the parts 2I projection l8 of a member 13 on one tape being adapted to be brought into and out of interlocking engagement with a recess I9 of an adjacent member I3 o the other tape by means of a slider 20 of conventional construction to close and open the fastener; in known manner. The fastening members I 3 and the stop members I6 and I I are made of non-metallic material such as Celluloid or other" cellulosic material (e. g. cellulose acetate), Bakelite or analogous plastic material.

Difliculties have been experienced hitherto in attaching to. the tape of a sliding clasp fastener non-metallic material of the character just mentioned. Securing such members by glue or other adhesive necessitates extreme careto avoid. the tapes becoming soiled during the gluing process. Resort to casting, moulding, or press-forming the members on the tapesin situ has the defect that the choice of shape forthe coupling projections and recesses is' restricted owing to the fact thatthe recesses have to correspond in shape to the projections and have to be so shaped that the mould or the like used for formingthe members can be easily removed notwithstanding bers are closely spaced on the tape.

According to the present invention, each mem. ber consists of complementary parts, generally two, one part beingcase, moulded, or press-- formed in situ on the tape,.while the other part is formed independently and subsequently joined to e first part, for example by means of an adhesive, the coupling projections and recesses being provided substantially on the second part.

Fig. 2 illustrates the tape Ill on to which are cast in situ parts 2|. Each part 2I surrounds .the beaded edge 14 of the tape III and has a recess 22 and a lug 23. In order to enable a plurality of parts 2I to be-formed simultaneously around the edge of the tape I 0 at the correct distance fromeach other, each lug 23 has an extension 24 connected to a rod-like member 25 ascertaining the distance between the parts 2| to be formed by means of a common mould. It will be seen that the parts 2| are not provided with coupling members. I

Fig. 3 shows a plurality of parts 26 having lugs 21 adapted to fit into the recesses 22 of the parts 2|. The parts 26 are'connected together to form a strip of partsby means of extensions 28 connected to a rod-like member 30 which ascertains the correct distance betweenthe parts 26. Each part 26 has a coupling projection I8 the fact that the 'memand the part its closed position, the slider member'36 has lugs 40 and 55 having a stepped (Extensions 63 64. Each part 62 is the parts 62. together with the rods may assume in practice,

and a corresponding recess IS. The recesses 22 and the corresponding lugs 21 are dovetailed.

As illustrated in Figs. 4 and 5, the parts 26 are joined to the parts 2| by inserting the lugs 21 into the recesses 22. The parts 26 are held in position by the lugs 23 which also close on one side the recesses 32 (see Fig. The parts 26 Q element .in situ are adhesively secured to the parts 2| by any suitable means such as acetone. have been joined to the parts 2| the lugs 2t together with the rod 25. and the lugs 28 together with the rods 30 are out off I The stop members |6 consist alsoof two parts one part being a part 2|, the other part 33 having the shape illustrated in Fig. 6. It possesses a lug After the parts 26 l 34 adapted to fit into the recess 22 of thepart 2 1 and a recess 35 accommodating the 1ug23' of the part 2|. It willbe appreciated that in the manufacture of a stringer, the part 2| for the stop member l6 may be formed simultaneously with the parts 2| for the fastening members proper. 33 of thestop member maybe formed simultaneously with the parts 21-of the fastening members. The part 33 is joined and adhesively secured to itscorresponding part :2|. Fig. 9 shows the upper. part of the fastener in being-omitted- The stop member H. at the closed end of the fastener is made by joining a bridge-like member 36 (see Figs. '1. 8 and 10) to parts 42 and 43 which are in shape identical with the parts 2|. Each 4| adapted to fit into recesses 44 and 45 of the parts "and .63. The bridge member 36 is joined and adhesively 'se-' cured to the parts42 and 43. Y

Figs. 11 to 20 illustrate a second embodiment of the sliding clasp fasteneraccording to this sponding coupling projections 5| and 52 extending into opposite directions. i w i In the manufacture of this sliding clasp fastener; parts 55 'are formed in situ'onthe tape around its beaded edger l5 (see Fig. l2) each'part recess'56 and-a lug .51 provided with an extension 60 joined to a connecting rod 6|. 'Again, the parts 55- donotpossess any coupling projections and recesses.

Fig. 13 shows astrip of parts two projections 5| 62 each having connect each part 62Ltoa rod stepped as indicated at ,65so 56 of a part 55. As will be more clearly appreciated from Figs. 14 and 15, the parts 62are joined to the parts 55 and adhesively secured thereto byany suitable means, thelugs 51 closing at one sidethe recesses 53 and5l of Subsequently the lugs 60 and 63,

6| and 64 are cut off." Agaimthe stop members 66 at the open'end of the fastener are formed oftwoparts 55 and 61 (see Figs. wand 19) The stop member 61 as to fit into the recess at the closed end of the "fastener comprises three parts, two parts being parts 55, connected together by a bridge member 10 (see Figs. 17, 18 and 20) p While I have shown and described in'thisspe'cification two embodiments which my invention it should be clearly under'stood that this description is only for the purspaced relationship to sliding clasp fastenpart of one fastener on an edge of a flexible fastener tape, forming a complementary part of said member independently of said first part, and securing said second part with said first part to form one fastener element on the fastener tape.

. 2. In the manufacture of sliding clasp fasteners, the steps of casting a part of a fastener member on anedge of a flexible support of the fastener, formir ig a complementary part of said member independently of said first part, applying said second part-to said first part and securing adhe'sively 'said second part to said first part, thereby forming a complete fastening member.

3."In the manufacture of sliding clasp fasteners thesteps of .casting simultaneously and in one another a plurality of parts offastening members on an edge of a fiexi- .ble support of the fastener, forming independentlyof said plurality of parts astrip consisting of a plurality of complementary parts of said mem- --bers, said second partsbeing interconnected with one another in the same spaced relationship, ap-

plying said second parts to said first parts, securing adhesively respective parts together and removing the connection: between the parts.

4. In the manufacture of sliding clasp fasteners the stepsof casting .onan edge of a flexible supportof the fastener. a plurality ofparts of parts and to facilitate the casting by a common mould, forming independently of 4 on the edge of a fastening members, forming on each part a recess, 2. lug. an extension on caching and a rodlike. member connecting said extensions to ascertain a desired spaced relationship between said of said parts said parts a strip ofcomplementaryparts, 9. lug on each of saidv second parts adapted to .fit into said recessof one of said first partsand means for. connecting said second parts together and ascertaining the desired spaced relationship between said second .parts, inserting and securing adhesively said lugs of said second parts insaid recesses of said tensions,- said rod-like member and said connecting means.

5. In the manufacture ofsliding clasp fasteners, the steps of forming atseries of fastener member parts in situ and in spaced relationship flexible stringer tape, formin connected spaced fastener member parts complementary to the series of fastener member ,parts, securing the complementary partsto the respective first parts to form complete fastener members andremoving the. connection between thecomplementary parts. I

. 6. In the manufacture of sliding clasp fasteners, the steps of i forming'a connected series of fastener member parts in situ and in spaced relationship on the edge of a flexible stringer tape, forming connected spaced fastener member parts complementary to the series of fastener member parts, securing the complementary parts to the respective first parts to form complete fastener members andremovingthe connections between the respective complementary parts and the first parts, whereby 1 the complete fastener elements are supportedon the edge of the flexible stringer apex. U

'7. Inthe manufacture of sliding clasp fasteners, the steps of forming in spaced relationship on the edge of a flexible stringer tape a series of first parts, andremoving said exparts of incomplete fastener members provided with tape gripping Jaws, forming a series of parts of an incomplete fastener member complementary to the first named series of parts and, connected in spaced relationship, each provided with an interlocking projection and recess structure, securing the complementary parts to the first named parts to form a complete fastener member and removing the connection between the complementary parts.

8. In the manufacture of sliding clasp fasten ers, the steps of forming in spaced relationship on the edge of a flexible stringer tape an integrally connected. series of parts of incomplete fastener members provided with tape gripping jaws, forming an integrally connected series of parts of an incomplete fastener member complementary to the first named series of parts and, connected in spaced relationship, each provided with an interlockingproiection and recess structure, securing the complementary parts to the first named parts to form a complete fastener member and removing the connection between the respective complementary parts and. the respective first named parts, whereby the complete fastener elements are supported on the edge of the flexible stringer tape.

9. In the manufacture of sliding clasp fasteners, the steps of forming along a flexible stringer tape a series of spaced similar fastener element sections, forming a series of spaced similar fastener element sections complementary to the first named fastener element sections in spaced relationship on a support of material identical with that of the elements, interconnecting the respective complementaryfastener element sections with the first named fastener element sections and separating the support from the completed fastener elements formed of the connected element sections.

10. In the manufacture of sliding clasp fasteners, the steps of mounting a series of similar segments of slide fastener elements in spaced relationship along a flexible stringer tape, mounting a series of similar segments of fastener elements complementary to the first named segments along a'support, interconnecting the respective series of segments and complementary segments en masse, to form a series of completed slide fastener elements, and separating from the completed slide fastener elementsthe support for the series of complementary segments.

' JOSEF KUNA. 

